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This paper presents the design and simulation results of a very compact microstrip patch antenna at 2.45/5.8 GHz for Radio Frequency Identification. A good size reduction of 76% compared to a conventional microstrip antenna is achieved. This antenna has a total area of 31X24 mm 2 and mounted on an FR4 substrate with dielectric permittivity constant 4.4, thickness of 1.6 mm, loss tangent of 0.025 and has a Microstrip feed Line. The antenna has a low return loss of about -22.35 dB with VSWR of almost 1.16 and a good gain of 2.63 dBi at 2.45 GHz and it has return loss of 43.26 dB, VSWR of 1.01 and gain of 3.74 dBi at 5.8 GHz. The performance of the proposed antenna is analyzed as well as compared with other RFID antennas at ISM band. It is has been studied, numerically analyzed, simulated using the CST and HFSS software.

A Compact Key-Shaped Antenna Design for Microwave Rfid Applications